Timer to go on a (battery op) riser for my home drip system?

The timers I have seen online at Home Depot are made to go onto a hose bib. I want to connect a timer to a riser in the garden and I'm guessing I will need an elbow hose valve between the riser and the timer (unless there are timers that screw right onto a riser). Also it should be readable and programmable from the angle it will rest at. A normal timer would be upside down because it screws into a hose bib at the top and the outlet to the tubing is below, exactly upside down for what I need. Thanks.